Lightronics DB624 - Manual (Page 4)

Page 4 of 9
DB - 624 LIGHTBAR DIMMER
Version: 0.6
OWNERS MANUAL
09/19/2008
www.lightronics.com
Lightronics Inc 509 Central Drive Virginia Beach, VA 23454 Tel 757 486 3588
KNOCKOUTS
Power access to the DB-624 is through the left end cover plate which has dual knockouts. The right end cover
plate also has dual knockouts which "punch out" in the opposite direction. These end cover plates may be
exchanged to accommodate your particular installation.
CONVERTING TO RIGHT HAND END POWER ACCESS
The DB-624 may be field converted to provide power connection access at the right hand end of the unit while
retaining correct orientation of the center control panel. This is done by removing the center control panel and
reinstalling it upside down. When this is done, the power input will be at the right end, The control panel will still
read "right side up", and the channel outputs will correctly correspond to the labeling.
The procedure is as follows:
1. Remove the 6 screws which attach the center panel to the main chassis and carefully pull the panel out. Note
the orientation of the two 6 pin, in line, connectors which connect to the rear center of the control circuit card.
2. Disconnect the two 6 pin inline connectors (depress the latching tabs to release them). On the circuit card
these are labeled as J1 (upper) and J2 (lower). Also disconnect the 2 pin inline connector
3. Rotate the center control panel so it reads upside down and reinstall the 6 pin connectors. Do not rotate or
move the female connectors which have wires in them. The connector which was attached to J1 should now
connect to J2 and vice versa.
4. Reconnect the 2 pin inline connector and reinstall the control panel.
3 PHASE POWER CONNECTIONS
True 3 phase power must be supplied to operate the DB-624 in the 3 phase configuration. This means that each
of the three input power hot legs (L1, L2, L3) must have a 120 degree electrical phase offset from each other.
The feed circuit must be able to supply 40 Amps for each hot leg.
The DB-624 is factory shipped to accommodate THREE PHASE, 120/208, Y power service. Consult the
applicable electrical codes for your location for exact wire specifications. The unit must be powered from a circuit
providing a minimum of 40 Amps per line (3 pole 40 Amp circuit breaker). The minimum wire size is AWG#8.
Wire may be either stranded or solid. The terminals are intended for copper wire only.
CONNECT POWER WIRES AS FOLLOWS
1 Remove the access cover at the end of the unit.
2 Connect the 3 "HOT" power input wires to the
L1, L2, L3 terminals.
3 Connect the neutral wire to the terminal marked
N.
4 Connect a ground wire to the CHASSIS GROUND terminal marked
G.
When operating the on three phase power, the DB-624 expects a particular phase sequence for these 3 input
power connections. It does not matter which phase is connected to the L1 terminal but L2 and L3 must be in the
correct order. The unit will not be damaged if these two connections are reversed but dimming will not occur
correctly and some channels will appear to be in a on/off mode. If this occurs – see the “Phase Sensing Jumper”
section in this manual and set the jumper block for 3 phase reverse operation.
A diagram of three phase power connections is shown below.
MAKE CERTAIN THAT THE INPUT POWER SOURCE IS
DE-ENERGIZED BEFORE MAKING CONNECTIONS.